1) What is the main organ of the respiratory system? a) Heart b) Lung c) Stomach d) Kidney 2) Which part of the body is the passageway for air when we breathe? a) Nose b) Liver c) Kidney d) Heart 3) What tiny hairs inside the nose help trap dust and dirt?Which part of the body is the passageway for air when we breathe? a) Bronchi b) Cilia c) Capillaries d) Alveoli 4) The tube that connects the throat (pharynx) to the lungs is called: a) Esophagus b) Diaphragm  c) Trachea d) Bronchioles 5) What part of the lungs branches into smaller tubes called bronchioles? a) Trachea b) Stomach c) Lung d) Bronchi 6) What is the small air sac in the lungs where gas exchange happens? a) Bronchi b) Capillaries c) Alveoli d) Larynx 7) Which organ helps us speak by producing sound? a) Larynx b) Nose c) Diaphragm d) Mouth 8) What dome-shaped muscle moves up and down when we breathe? a) Spine b) Diaphragm c) Trachea d) Skull 9) When we inhale, the diaphragm moves: a) Up b) Down c) Sideways d) Forward 10) Which blood vessels surround the alveoli to exchange oxygen and carbon dioxide? a) Nerve b) Arteries c) Capillaries d) Oxygen 11) What gas do we breathe in that our body needs? a) Hydrogen b) Nitrogen c) Carbon Dioxide d) Oxygen 12) What gas do we release when we exhale? a) Oxygen b) Nitrogen c) Carbon Dioxide d) Helium 13) The respiratory system works closely with what system to deliver oxygen to the whole body? a) Digestive System b) Circulatory System  c) Integumentary System d) Skeletal System 14) Which part of the respiratory system splits into left and right lungs? a) Diaphragm b) Lungs c) Bronchi d) Heart 15) What protects the lungs from injury? a) Skull b) Rib Cage c) Skin d) Stomach 16) Breathing in is called: a) Respiration b) Inhalation c) Exhalation d) Perspiration 17) Breathing out is called: a) Respiration b) Inhalation c) Exhalation d) Perspiration 18) Which layer of the lungs contains the alveoli? a) Nose b) Lungs c) Bronchioles d) Trachea 19) The trachea is also known as the: a) Voice box b) Rib Cage c) Food Pipe d) Wind Pipe 20) Why is the respiratory system important? a) It helps us digest food. b) It allows us to breathe and get oxygen. c) It pumps blood to the body. d) It supports the bones.

Respiratory System Quiz for Grade 6 Maawain

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